TEM@BNL: February 2011

At Brookhaven National Laboratory’s Center for Functional Nanomaterials and the Department of Condensed Matter Physics and Materials Science, scientists Yimei Zhu and Dong Su simultaneously examined the crystal structure and electron structure of the interfaces in an atom-by-atom fashion based on ultra-high-resolution imaging and spectroscopy. These studies helped the multi-institutional team discover that the addition of a single layer of atoms at an oxide interface can drastically alter the conductivity of the material, from highly conductive to completely insulating, depending on the element used. In particular, Brookhaven scientists played a key role in revealing the origin of an electron “gas” that forms at the interface...

http://www.bnl.gov/bnlweb/pubaf/pr/PR_display.asp?prID=1237

1. Chen, H., Wu, L., Zhang, L., Zhu, Y., Grey, C.P., “LiCoO2 Concaved Cuboctahedrons from symmetry -controlled topological reactions”, J. Am. Chem. Soc., in press.

2. Ferrari, L., Matteucci, G., Schofield, M.A., Beleggia, M., and Zhu, Y., “Near-Curie magnetic anomaly at the Ni/C interface observed by electron holography”, J. of Mag. Mag. Mater., 322 858–865 (2010).

3. Han, M.-G., Zhu, Y., Sasaki, K., Kato, T., Fisher, C.A.J., Hirayama, T., “Direct measurement of electron beam induced currents in p-type silicon”, Solid-State Electronics 54 777–780 (2010).

4. Han, W., Su, D., Murphy, M., Ward, M., Sham, T.K., Wu, L., Zhu, Y., Hu, Y., and Aoki, T., “ Microstructure and electronic behavior of PtPd@Pt core/shell nanowires”, J. of Materials Research 25, 711 (2010).

5. He, J. Q.; Volkov V. V.; Beleggia M.; Asaka T.; Tao J.; Schofield M. A.; Zhu Y., “Ferromagnetic domain structures and spin configurations measured in doped manganites”, Phys. Rev. B 81, 094427 (2010).

6. He, J.Q., Sootsman, J.R., Joseph, R., Girard, S.N., Zheng, J.C., Wen, .JG., Zhu, Y., Kanatzidis, M.G., Mercouri, G., Dravid, V.P., “On the Origin of Increased Phonon Scattering in Nanostructured PbTe Based Thermoelectric Materials”, J. Am. Chem. Soc., 132 8669-8675 (2010).

7. He, J.Q., Volkov, V. V., Asaka, T., Chaudhuri, S., Budhani, R. C., and Zhu, “Competing two-phase coexistence in doped manganite: direct observations by Lorentz electron microscopy”, Phys. Rev. B 82 224404 (2010).

8. Huang, L., Schofield, M.A., and Zhu, Y., “Control of Double-Vortex Domain Configurations in a Shape-Engineered Trilayer Nanomagnet System”, Adv. Mater., 22, 492–495 (2010).

9. Inada, H., Su, D., Egerton, R.F., Konno, M., Wu, L., Ciston, J., Wall, J., and Zhu, Y., “Atomic Imaging Using Secondary Electrons in a Scanning Transmission Electron Microscope : Experimental Observations and Possible Mechanisms”, invited articles for the special issue in honor of John Spence, Ultramicroscopy, in press.

10. Jang, H. W.; Felker, D. A.; Wang, Y.; Niranjan, M. K.; Zhang, Y.; Nelson, C. T.; Su, D.; Folkman, C. M.; Bark, C. W.; Baek, S. H.; Lee, S.; Janicka, K.; Zhu, Y.; Pan, X. Q.; Fong, D.; M. S. Rzchowski, C. B. E., “Strongly-correlated two-dimensional electron gas at oxide interfaces”, Science, 2011, in press.

11. Jiang, M., Lim, B., Tao, J., Camargo, P. H. C., Ma, C.. Zhu, Y., and Xia, Y., “Controlling the nucleation and growth modes of Pt in seed-mediated syntheses of Pd-Pt bimetallic nanocrystals”, Nanoscale, Advance Article DOI:10.1039/C0NR00324G (Paper) (2010).

12. Kolpak, A.M., Walker, F. J.; Reiner, J. W., Segal, Y., Su, D., Sawicki, M. S., Broadbridge, C. C., Zhang, Z., Zhu, Y., Ahn, C. H., and Ismail-Beigi, S., “Interface-induced polarization and inhibition of ferroelectricity in epitaxial SrTiO3/Si”, Phys. Rev. Lett, 105, 217601 (2010).

13. Lau, J.W, Morrow, Read, J.C., Hoink, V., Egelhoff, W.F., Huang, L., Zhu, Y., “In situ tunneling measurements in a transmission electron microscope on nanomagnetic tunnel junctions”, Appl. Phys. Lett., 96 262508 (2010).

14. Morosan E.; Wagner K. E.; Zhao Liang L.; Hor Y.; Williams A. J.; Tao J.; Zhu Y.; and Cava R. J., “Multiple electronic transitions and superconductivity in PdxTiSe2”, Phys. Rev. B 81, 094524 (2010), highlighted as an Editor’s suggestion.

15. Ngai, J. H., Segal, Y., Su, D., Zhu, Y., Walker, F.J., Ismail-Beigi, S., Le Hur, K., and Ahn1, C.H., “Electric field tuned crossover from classical to weakly localized quantum transport in electron doped SrTiO3”, Phys. Rev. B 81, 241307 (R) (2010).

16. Ofan, A., Zhang, L., Gaathon, O., Bakhru, S., Bakhru, H., Zhu, Y., Welch, D.O., and Osgood, Jr. R.M., “Spherical solid He nanometer bubbles in an anisotropic complex oxide”, Phys. Rev. B 82, 104113 (2010).

17. Ofan, A., Gaathon, O., Zhang, L., Evans-Lutterodt, K., Bakhru, S., Bakhru, H., Zhu, Y., Welch, D., Osgood, Jr. R.M., “Twinning and dislocation pileups in heavily implanted LiNbO₃”, Phys. Rev. B, in press.

18. Pan, Z., Tao, J., Zhu, Y., Huang, J.-H., and Paranthaman, M.P., “Spontaneous Growth of ZnCO3 Nanowires on ZnO Nanostructures in Normal Ambient Environment: Unstable ZnO Nanostructures”, Chem. Mater., 22, 149–154 (2010).

19. Si,W., Jie, Q., Wu, L., Zhou, J., Gu, G., Johnson, P.D., and Li, Q., “Superconductivity in epitaxial thin films of Fe1.08Te:Ox”, Phys. Rev. B 81, 092506 (2010).

20. Solovyov, V.F., Develos-Bagarinao, K., Si, W.D., Wu, L., Zhou, J., Qing, J., and Li, Q., “High irreversibility field of YBa2Cu3O7 films intercalated with a long-period metastable cuprate phase”, J. Appl. Phys., in press.

21. Su, D., Yang, B., Jiang, N., Sawicki, M., Broadbridge, C., Couillard, M., Reiner, J.W., Walker, F.J., Ahn, C.H., and Zhu, Y., “Valence electron energy-loss spectroscopy of ultrathin SrTiO3 films grown on silicon (100) single crystal”, Appl. Phys., Lett., 96, 121914 (2010).

22. Su, D., and Zhu, Y., “Scanning moire´ fringe imaging by scanning transmission electron microscopy”, Ultramicroscopy 110 229–233 (2010).

23. Sutter, E., Albrecht, P., Wang, B., Bocquet, M.-L., Wu, L., Zhu, Y., and Sutter, P., “Monodisperse Ru nanocluster arrays templated by monolayer graphene on Ru”, Surface Science, in press.

24. Tan, Z., Patel, V., Likharev, K.K., Su, D., and Zhu, Y., “Experimental study of resistive bistability in metal oxide junctions”, Appl.Phys. A, DOI 10.1007/s00339-010-6079-0 Oct. (2010)

25. Wang, H., Altman, E., Broadbridge, C., Zhu, Y., and Henrich, V., “Determination of electronic structure of oxide-oxide interfaces by photoemission spectroscopy”, Materials views article, Adv. Mater., 22, 2950–2956 (2010).

26. Wang, J.X., Inada, H., Wu, L., Zhu, Y., Choi, Y.-M., Liu, P., Zhou, W.-P., and Adzic, R.R., “Oxygen Reduction on Well-Defined Core-Shell Nanocatalysts: Particle Size, Facet, and Pt Shell Thickness Effects”, J. Am. Chem. Soc., 131, 17298–17302 (2009).

27. Wang, F., Graetz, J., Moreno, M.S., Ma, C., Wu, L., Volkov, V.V., and Zhu, Y., “Chemical Distribution and Bonding State of Lithium in Intercalated Graphite: Identification with Optimized Electron Energy-loss Spectroscopy”, ACS Nano, 5, 1190-1197 (2011).

28. Zeng, J.; Tao, J.; Li, W.; Grant, J.; Zhu, Y. and Xia, Y., “A mechanistic study on the formation of silver nanoplates in the presence of silver seeds and citric acid or citrate ions”, Chemistry: An Asian Journal, in press.

29. Zeng, J., Zheng, Y., Rycenga, M., Tao, J., Li, Z.-Y., Zhang, Q., Zhu, Y., and Xia, Y., “Controlling the Shapes of Silver Nanocrystals with Different Capping Agents”, J. Am. Chem. Soc., 132, 8552–8553 (2010).

30. Zhang, Y., Chen, H., Choi, G., Raghothamachar, B., Dudley, M., Edgar, J.,Grasza, K., Tymicki, E., Zhang, L., Su, D., and Zhu, Y., “Nucleation Mechanism of 6H-SiC Polytype Inclusions Inside 15R-SiC Crystals”, J. Electronic Materials, 39 799-804 (2010).

31. Zheng, J.C., Frenkel, A.I., Wu, L., Hanson, J., Ku, W., Božin, E.S., Billinge, S. J. L., and Zhu, Y., “Nanoscale disorder and local electronic properties of CaCu3Ti4O12: An integrated study of electron, neutron, and x-ray diffraction, x-ray absorption fine structure, and first-principles calculations”, Phys. Rev., B 81, 144203 (2010).

32. Zhou, W.P., Sasaki, K., Su, D., Zhu, Y., Wang, J.X., and Adzic, R.R., “Gram-Scale-Synthesized Pd2Co-Supported Pt Monolayer Electrocatalysts for Oxygen Reduction Reaction”, J. Phys. Chem. C 114, 8950–8957 (2010).

33. Zhou, X., Wang, F., Zhu, Y., and Liu, Z., J. of Mater. Chem. “Graphene modified LiFePO₄ cathode materials for high power lithium ion batteries”, in press.